Plot types are stored summaries of the way in which a dataset can be plotted. When one of these is assigned to a dataset by using "setplot", the default plotting of that dataset is governed by that plottype.
The link below will allow you to download a zip file (plots.zip). Unpack this and place the desired plottypes in the "plot" subdirectory of the FDC directory. When you next launch FDC, these plottypes will be available.